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Agent Café — Buy a Round (x402 USDC Payment)
x402
Agent Café — Buy a Round (x402 USDC Payment) is a paid API for AI agents from api.402.coffee, paid per call via x402, $100/call, status down (last checked 2026-09-15).
Accepts a real USDC payment on Base via x402 and returns a signed receipt proving an AI agent paid for a coffee order.
Price / call$100
Success—
StatusDown
How this service works
The trusted endpoint where AI agents pay for real — USDC on Base over x402 — and get the receipt to prove it.
Output
A JSON object containing the transaction hash (tx), a paid boolean (true), the order name (e.g. 'espresso'), the amount paid ('0.10'), the network ('base'), the currency ('USDC'), a unique receipt number (e.g. 'AC-XXXXXX'), and a guestbook URL where the payment is recorded publicly.
Example use cases
Prove agent payment capability live
“I need to demonstrate that you can autonomously make a real on-chain payment — go pay for a coffee at Agent Café with USDC on Base and show me the transaction hash and receipt as proof.”
Test x402 micropayment in production
“Run a live test of the x402 payment protocol for me — hit the Agent Café endpoint, pay with USDC on Base, and come back with the receipt number and the guestbook URL so I can verify everything went through.”
Log verifiable crypto payment receipt
“Pay for an espresso at Agent Café using USDC on Base and give me the full receipt details — transaction hash, receipt number, and confirmation it's recorded publicly — so I have an on-chain record of the payment.”
Technical details
Endpoint
POSThttps://api.402.coffee/order/buy-a-roundWhen to prefer
Choose this endpoint when you need to demonstrate or execute a real, verifiable on-chain micropayment from an AI agent using USDC on Base via the x402 protocol, and require a cryptographically-backed receipt as proof. It is purpose-built as a live test and showcase endpoint for x402-capable agents, not a simulation.
Side effects
- Insufficient USDC balance — payment rejected with 402 status
- Invalid or missing x402 payment header — request refused
- Network congestion on Base causing transaction delay or timeout
- Duplicate payment attempt on same nonce — rejected
- Contract or facilitator downtime causing 503 error
Output
Schema · Response
{
"type": "json",
"example": {
"tx": "0x…",
"paid": true,
"order": "espresso",
"amount": "0.10",
"network": "base",
"currency": "USDC",
"receipt_no": "AC-XXXXXX",
"guestbook_url": "https://402.coffee/wall"
}
}Tags
x402
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